The Westgate SuperBook on Sunday dropped the Buckeyes from 3-1 to 6-1 to win the national championship, a day after Ohio State suffered a humbling 31-16 defeat at home to Oklahoma.

The Buckeyes dropped from No. 2 to No. 8 in this week's AP Top 25, but remain the second-favorites, along with USC and behind only No. 1 Alabama. The Crimson Tide are 8-5 at the Westgate.

Oklahoma moved up from 18-1 to 8-1 at the Westgate, but is still behind the Buckeyes.

Other sportsbooks were more aggressive with Ohio State's odds. William Hill's Nevada sportsbook dropped the Buckeyes back to 12-1 to win the national title. But the consensus belief among Las Vegas oddsmakers is that Ohio State remains a playoff contender.

"The year Ohio State won the national championship, they lost to Virginia Tech in their first home game [of 2014]," said Ed Salmons, assistant manager and head football oddsmaker at the Westgate. "If they still win their games in front of them, they're going to be in the playoffs. So I'm not writing anyone off. The talent level is still there."

The Buckeyes currently would be favored over every team remaining on their schedule. The Westgate has Ohio State as a 7-point favorite over Penn State when the Nittany Lions visit Columbus on Oct. 28. The Buckeyes are 4.5-point road favorites over Michigan in their season-ending showdown Nov. 25.